<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script>

function boom()
{
  var select = document.getElementById("sss");
  select.options.add.call(null, 0);
}

</script>
</head>

<body onload="boom();">

<select id="sss"><option>foo</option></select>

</body>
</html>
